/*
 * Copyright (c) 2004-2022, University of Oslo
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors 
 * may be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.hisp.dhis.helpers.file;

import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.function.Consumer;
import java.util.function.Function;
import org.hisp.dhis.test.e2e.actions.IdGenerator;
import org.hisp.dhis.test.e2e.helpers.JsonObjectBuilder;
import org.hisp.dhis.test.e2e.helpers.JsonParserUtils;

/**
 * @author Gintare Vilkelyte <vilkelyte.gintare@gmail.com>
 */
public class JsonFileReader implements FileReader {
  private JsonObject obj;

  public JsonFileReader(File file) throws IOException {
    byte[] content = Files.readAllBytes(Paths.get(file.getPath()));

    String json = new String(content);

    obj = new JsonParser().parse(json).getAsJsonObject();
  }

  public JsonFileReader read(File file) throws IOException {
    return new JsonFileReader(file);
  }

  @Override
  public FileReader replacePropertyValuesWithIds(String propertyName) {
    return replacePropertyValuesWith(propertyName, "uniqueid");
  }

  /***
   * Replaces all occurrences of a string with unique generated id
   */
  public JsonFileReader replaceStringsWithIds(String... strToReplace) {
    String replacedJson = obj.toString();
    for (String s : strToReplace) {
      replacedJson = replacedJson.replaceAll(s, new IdGenerator().generateUniqueId());
    }

    obj = JsonParserUtils.toJsonObject(replacedJson);

    return this;
  }

  @Override
  public JsonFileReader replacePropertyValuesWith(String propertyName, String replacedValue) {
    replace(
        p -> {
          JsonObject object = ((JsonElement) p).getAsJsonObject();
          if (replacedValue.equalsIgnoreCase("uniqueid")) {
            object.addProperty(propertyName, new IdGenerator().generateUniqueId());
          } else {
            object.addProperty(propertyName, replacedValue);
          }

          return object;
        });

    return this;
  }

  @Override
  public JsonFileReader replacePropertyValuesRecursivelyWith(
      String propertyName, String replacedValue) {
    replace(
        obj,
        jsonObject -> {
          if (!jsonObject.has(propertyName)) {
            return;
          }
          if (replacedValue.equalsIgnoreCase("uniqueid")) {
            jsonObject.addProperty(propertyName, new IdGenerator().generateUniqueId());
          } else {
            jsonObject.addProperty(propertyName, replacedValue);
          }
        });

    return this;
  }

  public JsonObject get() {
    return obj;
  }

  public JsonObjectBuilder getAsObjectBuilder() {
    return new JsonObjectBuilder(obj);
  }

  @Override
  public JsonFileReader replace(Function<Object, Object> function) {
    JsonObject newObj = new JsonObject();
    for (String key : obj.keySet()) {
      JsonElement element = obj.get(key);
      if (element.isJsonArray()) {
        JsonArray array = new JsonArray();
        for (JsonElement e : element.getAsJsonArray()) {
          array.add((JsonElement) function.apply(e));
        }
        newObj.add(key, array);
      } else {
        newObj.add(key, (JsonElement) function.apply(element));
      }
    }

    obj = newObj;
    return this;
  }

  private void replace(JsonElement root, Consumer<JsonObject> function) {
    if (root.isJsonArray()) {
      for (JsonElement e : root.getAsJsonArray()) {
        replace(e, function);
      }
    } else if (root.isJsonObject()) {
      JsonObject jsonObjRoot = root.getAsJsonObject();
      function.accept(jsonObjRoot);
      for (String key : jsonObjRoot.keySet()) {
        JsonElement element = jsonObjRoot.get(key);
        if (element.isJsonArray()) {
          replace(element, function);
        }
      }
    }
  }
}
